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Copyright>        Copyright (C) 1986-2024 Altair Engineering Inc.
Copyright>
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Copyright>
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Chd|====================================================================
Chd|  DT38LAW                       source/materials/time_step/dt138aw.F
Chd|-- called by -----------
Chd|        DTMAIN                        source/materials/time_step/dtmain.F
Chd|-- calls ---------------
Chd|        DTEL                          source/materials/time_step/dtel.F
Chd|        DTSPH                         source/materials/time_step/dtsph.F
Chd|====================================================================
      SUBROUTINE DT38LAW(PM,GEO,PID, MAT, DELTAX, AIRE, VOL, DTX)
C
C     CALCUL DES DT ELEM. DES LOIS 38
C
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   G l o b a l   P a r a m e t e r s
C-----------------------------------------------
#include      "mvsiz_p.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "param_c.inc"
#include      "vect01_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      my_real
     .   PM(NPROPM,*),GEO(NPROPG,*), DELTAX(*), AIRE(*), VOL(*), DTX(*)
      INTEGER PID(*),MAT(*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I, MX
C     REAL
      my_real
     .   RHO0(MVSIZ), G(MVSIZ), C1(MVSIZ), SSP(MVSIZ),NU,E,
     .   VIS(MVSIZ)
C=======================================================================
      DO I=LFT,LLT
      MX      =MAT(I)
      RHO0(I) =PM( 1,MX)
      G(I)    =PM(22,MX)
      NU      =PM(21,MX)
      E       =PM(20,MX)
      C1(I)   =E/(THREE*(ONE-TWO*NU))
      END DO
      
C-----------------------------
C     CALCUL DE VITESSE DU SON
C-----------------------------
      DO I=LFT,LLT
         SSP(I)=SQRT((FOUR_OVER_3*G(I)+C1(I))/RHO0(I))
      END DO
      
C----------------------------------
C     CALCUL DES DT ELEMENTAIRES
C----------------------------------
      VIS(:) = ZERO
      IF(JSPH==0)THEN
         CALL DTEL(SSP,PM,GEO,PID,MAT, RHO0, VIS, DELTAX, AIRE, VOL, DTX)
      ELSE
         CALL DTSPH(SSP,PM,GEO,PID,MAT, RHO0, VIS, DELTAX, VOL, DTX)
      ENDIF
C-----------
      RETURN
      END
